Write the expression in standard form 5(2a)+7(-4b)+2.c.5

Do not comment if you aren’t going to . create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

For how answer my question this will be the last question can you answer in math subject

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?